1 /* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
9 #ifdef _LARGEFILE64_SOURCE
10 # ifndef _LARGEFILE_SOURCE
11 # define _LARGEFILE_SOURCE 1
13 # ifdef _FILE_OFFSET_BITS
14 # undef _FILE_OFFSET_BITS
19 # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
21 # define ZLIB_INTERNAL
39 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
50 #ifdef NO_DEFLATE /* for compatibility with old definition */
51 # define NO_GZCOMPRESS
54 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
55 # ifndef HAVE_VSNPRINTF
56 # define HAVE_VSNPRINTF
60 #if defined(__CYGWIN__)
61 # ifndef HAVE_VSNPRINTF
62 # define HAVE_VSNPRINTF
66 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
67 # ifndef HAVE_VSNPRINTF
68 # define HAVE_VSNPRINTF
72 #ifndef HAVE_VSNPRINTF
74 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
75 but for now we just assume it doesn't. */
82 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
83 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
84 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
85 # define vsnprintf _vsnprintf
103 /* unlike snprintf (which is required in C99, yet still not supported by
104 Microsoft more than a decade later!), _snprintf does not guarantee null
105 termination of the result -- however this is only used in gzlib.c where
106 the result is assured to fit in the space provided */
108 # define snprintf _snprintf
112 # define local static
114 /* compile with -Dlocal if your debugger can't find static symbols */
116 /* gz* functions always use library allocation functions */
118 extern voidp malloc OF((uInt size));
119 extern void free OF((voidpf ptr));
122 /* get errno and strerror definition */
124 # include <windows.h>
125 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
129 # define zstrerror() strerror(errno)
131 # define zstrerror() "stdio error (consult errno)"
135 /* provide prototypes for these when building zlib without LFS */
136 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
138 #define z_off64_t z_off_t
141 gzFile gzopen64 OF((const char *, const char *));
142 z_off64_t gzseek64 OF((gzFile, z_off64_t, int));
143 z_off64_t gztell64 OF((gzFile));
144 z_off64_t gzoffset64 OF((gzFile));
147 /* default memLevel */
148 #if MAX_MEM_LEVEL >= 8
149 # define DEF_MEM_LEVEL 8
151 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
154 /* default i/o buffer size -- double this for output when reading (this and
155 twice this must be able to fit in an unsigned type) */
156 #define GZBUFSIZE 8192
158 /* gzip modes, also provide a little integrity check on the passed structure */
161 #define GZ_WRITE 31153
162 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
164 /* values for gz_state how */
165 #define LOOK 0 /* look for a gzip header */
166 #define MODE_COPY 1 /* copy input directly */
167 #define MODE_GZIP 2 /* decompress a gzip stream */
171 /* internal gzip file state data structure */
173 /* exposed contents for gzgetc() macro */
174 struct gzFile_s x; /* "x" for exposed */
175 /* x.have: number of bytes available at x.next */
176 /* x.next: next output data to deliver or write */
177 /* x.pos: current position in uncompressed data */
178 /* used for both reading and writing */
179 int mode; /* see gzip modes above */
180 int fd; /* file descriptor */
181 char *path; /* path or fd for error messages */
182 unsigned size; /* buffer size, zero if not allocated yet */
183 unsigned want; /* requested buffer size, default is GZBUFSIZE */
184 unsigned char *in; /* input buffer */
185 unsigned char *out; /* output buffer (double-sized when reading) */
186 int direct; /* 0 if processing gzip, 1 if transparent */
187 /* just for reading */
188 int how; /* 0: get header, 1: copy, 2: decompress */
189 z_off64_t start; /* where the gzip data started, for rewinding */
190 int eof; /* true if end of input file reached */
191 int past; /* true if read requested past end */
192 /* just for writing */
193 int level; /* compression level */
194 int strategy; /* compression strategy */
196 z_off64_t skip; /* amount to skip (already rewound if backwards) */
197 int seek; /* true if seek request pending */
198 /* error information */
199 int err; /* error code */
200 char *msg; /* error message */
201 /* zlib inflate or deflate stream */
202 z_stream strm; /* stream structure in-place (not a pointer) */
204 typedef gz_state FAR *gz_statep;
206 /* shared functions */
207 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
209 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
212 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
213 value -- needed when comparing unsigned to z_off64_t, which is signed
214 (possible z_off64_t types off_t, off64_t, and long are all signed) */
216 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
218 unsigned ZLIB_INTERNAL gz_intmax OF((void));
219 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())